with a musical keyboard, which is a row of small keys that can be pressed. Every key generates one or more sounds; most keyboard instruments have extra means (pedals for a piano, stops and a pedal keyboard for an organ) to manipulate these sounds. They may produce sound by wind being fanned (organ) or pumped (accordion), vibrating strings either hammered (piano) or plucked (harpsichord), by electronic means (synthesizer), or in some other way. Sometimes, instruments that do not usually have a keyboard, such as the glockenspiel, are fitted with one. Though they have no moving parts and are struck by mallets held in the player's hands, they have the same physical arrangement of keys and produce soundwaves in a similar manner. The theremin, an electrophone, is played without physical contact by the player. The theremin senses the proximity of the player's hands, which triggers changes in its sound. More recently, a MIDI controller keyboard used with a digital audio workstation may have a musical keyboard and a bank of sliders, knobs, and buttons that change many sound parameters of a synthesizer. Instrumentalist A person who plays a musical instrument is known as an instrumentalist or instrumental musician. Many instrumentalists are known for playing specific musical instruments such as guitarist (guitar), pianist (piano), bassist (bass), and drummer (drum). These different types of instrumentalists can perform together in a music group. A person who is able to play a number of instruments is called a multi-instrumentalist. According to David Baskerville in the book Music Business Handbook and Career Guide, the working hours of a full-time instrumentalist may average only three hours a day, but most musicians spent at least forty hours a week. See also List of musical instruments Folk instrument Experimental musical instrument Recording studio as an instrument Music instrument technology Orchestra Notes References Further reading Music Library Association (1974). Committee on Musical Instrument Collections. A Survey of Musical Instrument Collections in the United States and Canada, conducted by a committee of the Music Library Association, William Lichtenwanger, chairman & compiler, ed. and produced by James W. Pruitt. Ann Arbor, Mich.: Music Library Association. xi, p. 137, '' External links